<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>negative-margin-element-center</title> 
<style type="text/css"> 
.wrapper{width:750px;position:relative;left:50%;margin-left:-375px;} 
.contentArea{width:450px;position:absolute;top:0;left:150px;height:500px;background:#96c;} 
.leftPanel{width:150px;position:absolute;top:0;left:0;height:500px;background:#999;} 
.rightPanel{width:150px;position:absolute;top:0;left:600px;height:500px;background:#06C;} 
</style> 
</head> 
<body> 
<div class="wrapper"> 
<div class="contentArea"></div> 
<div class="leftPanel"></div> 
<div class="rightPanel"></div> 
</div> 
</body> 
</html>